US5627938A - Rate loop processor for perceptual encoder/decoder - Google Patents
Rate loop processor for perceptual encoder/decoder Download PDFInfo
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- US5627938A US5627938A US08/310,898 US31089894A US5627938A US 5627938 A US5627938 A US 5627938A US 31089894 A US31089894 A US 31089894A US 5627938 A US5627938 A US 5627938A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
- H04B1/665—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using psychoacoustic properties of the ear, e.g. masking effect
Abstract
Description
X(k)=-X(2N-k).
M×2×4×N
tmpx=1.05(j-i),
x=8minimum((tmpx-0.5).sup.2 -2(tmpx-0.5),0)
tmpy=15.811389+7.5(tmpx+0.474)-17.5(1.+(tmpx+0.474).sup.2).sup.0.5
r.sub.ω =2r.sub.ω (t-1)-r.sub.ω (t-2)
φ.sub.ω =2φ.sub.ω (t-1)-φ.sub.ω (t-2)
tb.sub.b =-0.299-0.43 log.sub.e (cb.sub.b)
SNR.sub.b =tb.sub.b TMN.sub.b +(1-tb.sub.b)NMT.sub.b
nb.sub.b =en.sub.b bc.sub.b
thr.sub.ω= max(nb.sub.ω, absthr.sub.ω).
bval.sub.ωhigh.sbsb.b -bval.sub.ωlow.sbsb.b <bandlength
nband.sub.n =minimum(thr.sub.ωlow.sbsb.n, . . . ,thr.sub.ωhigh.sbsb.n)
nthr.sub.SUM =MAX[THRn.sub.SUM, MIN(THRn.sub.DIF, THRn.sub.MLD,DIF)]nthr.sub.DIF =MAX[THRn.sub.DIF, MIN(THRn.sub.SUM, THRn.sub.MLD,SUM)]
Δ=Δ.sub.0.sup.α ×Δ.sub.A.sup.(1-alpha)
Δ=Q.sup.-1 (Q(Δ))
C=FOO(Q(C.sub.f, Δ), Q(Δ))
when C>PR, α.sub.high =α,
when C<PR, α.sub.low =α.
Claims (4)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/310,898 US5627938A (en) | 1992-03-02 | 1994-09-22 | Rate loop processor for perceptual encoder/decoder |
US10/218,232 USRE39080E1 (en) | 1988-12-30 | 2002-08-13 | Rate loop processor for perceptual encoder/decoder |
US11/248,622 USRE40280E1 (en) | 1988-12-30 | 2005-10-12 | Rate loop processor for perceptual encoder/decoder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US84481192A | 1992-03-02 | 1992-03-02 | |
US08/310,898 US5627938A (en) | 1992-03-02 | 1994-09-22 | Rate loop processor for perceptual encoder/decoder |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US84481192A Continuation | 1988-12-30 | 1992-03-02 | |
US10/218,232 Continuation USRE39080E1 (en) | 1988-12-30 | 2002-08-13 | Rate loop processor for perceptual encoder/decoder |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/218,232 Reissue USRE39080E1 (en) | 1988-12-30 | 2002-08-13 | Rate loop processor for perceptual encoder/decoder |
US11/248,622 Reissue USRE40280E1 (en) | 1988-12-30 | 2005-10-12 | Rate loop processor for perceptual encoder/decoder |
Publications (1)
Publication Number | Publication Date |
---|---|
US5627938A true US5627938A (en) | 1997-05-06 |
Family
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/310,898 Ceased US5627938A (en) | 1988-12-30 | 1994-09-22 | Rate loop processor for perceptual encoder/decoder |
US10/218,232 Expired - Lifetime USRE39080E1 (en) | 1988-12-30 | 2002-08-13 | Rate loop processor for perceptual encoder/decoder |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/218,232 Expired - Lifetime USRE39080E1 (en) | 1988-12-30 | 2002-08-13 | Rate loop processor for perceptual encoder/decoder |
Country Status (5)
Country | Link |
---|---|
US (2) | US5627938A (en) |
EP (1) | EP0559348A3 (en) |
JP (1) | JP3263168B2 (en) |
KR (1) | KR970007663B1 (en) |
CA (1) | CA2090160C (en) |
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EP0559348A3 (en) | 1993-11-03 |
JPH0651795A (en) | 1994-02-25 |
KR930020412A (en) | 1993-10-19 |
CA2090160A1 (en) | 1993-09-03 |
EP0559348A2 (en) | 1993-09-08 |
KR970007663B1 (en) | 1997-05-15 |
JP3263168B2 (en) | 2002-03-04 |
USRE39080E1 (en) | 2006-04-25 |
CA2090160C (en) | 1998-10-06 |
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